同步送粉激光熔注WC-W_2C_p/4Cr5MoSiV1复合材料层微观组织及摩擦磨损性能
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摘要
以铸造WC (WC/W_2C共晶)作为增强颗粒,4Cr5MoSiV1作为熔注层金属基体,采用激光熔注技术在Q235表面制备WC_p/4Cr5MoSiV1金属基复合材料层。采用XRD、OM、SEM和EDS对涂层的物相、宏观形貌和微观组织进行了表征分析,测试了涂层沿深度方向上的显微硬度,室温条件下进行销盘式面接触干滑动摩擦磨损试验,利用SEM对磨损表面进行微观组织分析。结果表明,复合材料层的相组成主要有γ-Fe、WC、M_2C、M_6C、M_(23)C_6、(Fe,W)_3C (M=Fe,Cr,W,Mo),碳化物在复合材料层中呈现不同的形态。复合材料层的HV_(0.2)硬度7237.4 MPa,是基材Q235硬度的4.6倍,较传统淬火态4Cr5MoSiV1高出50%。复合材料层的平均摩擦系数为0.283,仅为硬质合金的87.1%, 4Cr5MoSiV1的61.1%;相对磨损率43.45,是硬质合金的1.7倍,4Cr5MoSiV1的43倍。
WC_p/4Cr5MoSiV1 metal matrix composite(MMC) on Q235 steel was produced by laser melt injection(LMI) using casting WC particles(WC_p) as reinforced particles and 4Cr5MoSiV1 steel particles as metal matrix. Microstructure of MMC layer was analyzed by X-ray diffraction(XRD), optical microscopy(OM) and scanning electron microscopy(SEM), microhardness was tested along the depth direction of the coatings, the pin-on-disk wear test was conducted at room temperature, and morphologies of worn surfaces was analyzed by SEM. Results show that the compound layer mainly comprises γ-Fe,WC,M_2C,M_6 C,M_(23)C_6,and(Fe,W)3 C(M=Fe,Cr,W,Mo),and carbides exhibit different forms in the composite layer. The hardness of the compound layer is 723.74 MPa, which is 4.6 times as large as that of the substrate and 50% higher than that of traditional hardened 4Cr5MoSiVl steel. The average friction coefficient of MMC layer is 0.283, which is only 87.1% of that of the cemented carbide and 61.1% of that of the 4Cr5MoSiV1 steel. The relative wear rate is 43.45,which is 1.7 times as large as that of the cemented carbide and 43 times that of the 4 Cr5 MoSiV1 steel.
WC_p/4Cr5MoSiV1 metal matrix composite(MMC) on Q235 steel was produced by laser melt injection(LMI) using casting WC particles(WC_p) as reinforced particles and 4Cr5MoSiV1 steel particles as metal matrix. Microstructure of MMC layer was analyzed by X-ray diffraction(XRD), optical microscopy(OM) and scanning electron microscopy(SEM), microhardness was tested along the depth direction of the coatings, the pin-on-disk wear test was conducted at room temperature, and morphologies of worn surfaces was analyzed by SEM. Results show that the compound layer mainly comprises γ-Fe,WC,M_2C,M_6 C,M_(23)C_6,and(Fe,W)3 C(M=Fe,Cr,W,Mo),and carbides exhibit different forms in the composite layer. The hardness of the compound layer is 723.74 MPa, which is 4.6 times as large as that of the substrate and 50% higher than that of traditional hardened 4Cr5MoSiVl steel. The average friction coefficient of MMC layer is 0.283, which is only 87.1% of that of the cemented carbide and 61.1% of that of the 4Cr5MoSiV1 steel. The relative wear rate is 43.45,which is 1.7 times as large as that of the cemented carbide and 43 times that of the 4 Cr5 MoSiV1 steel.
引文
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